﻿define([
    'angular'
], function (ng) {
    /*
    Javascript base64_encode() base64加密函数
    用于生成字符串对应的base64加密字符串
    @param string str 原始字符串
    @return string 加密后的base64字符串
    */
    function base64_encode(str) {
        var c1, c2, c3;
        var base64EncodeChars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
        var i = 0, len = str.length, string = '';

        while (i < len) {
            c1 = str.charCodeAt(i++) & 0xff;
            if (i == len) {
                string += base64EncodeChars.charAt(c1 >> 2);
                string += base64EncodeChars.charAt((c1 & 0x3) << 4);
                string += "==";
                break;
            }
            c2 = str.charCodeAt(i++);
            if (i == len) {
                string += base64EncodeChars.charAt(c1 >> 2);
                string += base64EncodeChars.charAt(((c1 & 0x3) << 4) | ((c2 & 0xF0) >> 4));
                string += base64EncodeChars.charAt((c2 & 0xF) << 2);
                string += "=";
                break;
            }
            c3 = str.charCodeAt(i++);
            string += base64EncodeChars.charAt(c1 >> 2);
            string += base64EncodeChars.charAt(((c1 & 0x3) << 4) | ((c2 & 0xF0) >> 4));
            string += base64EncodeChars.charAt(((c2 & 0xF) << 2) | ((c3 & 0xC0) >> 6));
            string += base64EncodeChars.charAt(c3 & 0x3F)
        }
        return string
    }
    /*
    Javascript base64_decode() base64解密函数
    用于解密base64加密的字符串
    @param string str base64加密字符串
    @return string 解密后的字符串
    */
    function base64_decode(str) {
        var c1, c2, c3, c4;
        var base64DecodeChars = new Array(
                -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
                -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
                -1, -1, -1, -1, -1, -1, -1, 62, -1, -1, -1, 63, 52, 53, 54, 55, 56, 57,
                58, 59, 60, 61, -1, -1, -1, -1, -1, -1, -1, 0, 1, 2, 3, 4, 5, 6,
                7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24,
                25, -1, -1, -1, -1, -1, -1, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36,
                37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, -1, -1, -1,
                -1, -1
        );
        var i = 0, len = str.length, string = '';

        while (i < len) {
            do {
                c1 = base64DecodeChars[str.charCodeAt(i++) & 0xff]
            } while (
                    i < len && c1 == -1
            );

            if (c1 == -1) break;

            do {
                c2 = base64DecodeChars[str.charCodeAt(i++) & 0xff]
            } while (
                    i < len && c2 == -1
            );

            if (c2 == -1) break;

            string += String.fromCharCode((c1 << 2) | ((c2 & 0x30) >> 4));

            do {
                c3 = str.charCodeAt(i++) & 0xff;
                if (c3 == 61)
                    return string;

                c3 = base64DecodeChars[c3]
            } while (
                    i < len && c3 == -1
            );

            if (c3 == -1) break;

            string += String.fromCharCode(((c2 & 0XF) << 4) | ((c3 & 0x3C) >> 2));

            do {
                c4 = str.charCodeAt(i++) & 0xff;
                if (c4 == 61) return string;
                c4 = base64DecodeChars[c4]
            } while (
                    i < len && c4 == -1
            );

            if (c4 == -1) break;

            string += String.fromCharCode(((c3 & 0x03) << 6) | c4)
        }
        return string;
    }
    angular.extend(angular, { 'base64_encode': function (str) { return base64_encode(str); }, "base64_decode": function (str) { return base64_decode(str); } });
});
